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CN209843907U - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
CN209843907U
CN209843907U CN201921157828.2U CN201921157828U CN209843907U CN 209843907 U CN209843907 U CN 209843907U CN 201921157828 U CN201921157828 U CN 201921157828U CN 209843907 U CN209843907 U CN 209843907U
Authority
CN
China
Prior art keywords
insulating heat
secondary battery
top cover
insulating
cover plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201921157828.2U
Other languages
Chinese (zh)
Inventor
肖海河
迟庆魁
柴志生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Times Amperex Technology Ltd
Original Assignee
Jiangsu Times Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Times Amperex Technology Ltd filed Critical Jiangsu Times Amperex Technology Ltd
Priority to CN201921157828.2U priority Critical patent/CN209843907U/en
Priority to EP19199774.1A priority patent/EP3770988B1/en
Priority to HUE19199774A priority patent/HUE066156T2/en
Priority to US16/658,626 priority patent/US20210028425A1/en
Application granted granted Critical
Publication of CN209843907U publication Critical patent/CN209843907U/en
Priority to PCT/CN2020/096441 priority patent/WO2021012842A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/143—Fireproof; Explosion-proof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/48—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The application relates to the technical field of energy storage devices, in particular to a secondary battery, which comprises: a housing having an opening; an electrode assembly housed in the case; the top cover assembly comprises a top cover plate and an electrode terminal arranged on the top cover plate, and the top cover plate is arranged at the opening; an interposer connected between the electrode assembly and the electrode terminal; and the insulating heat dissipation piece is arranged between the top cover plate and the adapter piece, and the heat conductivity coefficient of the insulating heat dissipation piece is greater than 1W/(m.k). The secondary battery that this application provided is through setting up insulating heat dissipation spare, insulating heat dissipation spare sets up between lamina tecti and switching piece, and insulating heat dissipation spare's coefficient of heat conductivity is greater than 1W/(m k), can make the switching piece when overflowing great, the heat of production can in time be conducted to the lamina tecti through insulating heat dissipation spare, also can further conduct to the casing, and then realizes the heat dissipation, prevents that the inside thermal runaway that takes place of secondary electricity, has improved secondary battery's security performance.

Description

Secondary battery
Technical Field
The application relates to the technical field of energy storage devices, in particular to a secondary battery.
Background
The secondary battery is an important component of a new energy automobile, and the safety performance thereof is very important. With the development of new energy automobiles, the demand for rapid charging is increasing at present.
However, when the secondary battery is charged rapidly, the interposer needs to bear a larger current, and thus the interposer also generates a higher amount of heat. If the heat generated by the adapter sheet cannot be timely transmitted to the outside, more and more heat is accumulated in the adapter sheet, so that most of the heat is transmitted to the electrode assembly, and the thermal runaway of the electrode assembly causes the ignition and explosion of the secondary battery.
SUMMERY OF THE UTILITY MODEL
The application provides a secondary battery to solve the problems in the prior art and improve the safety performance of the secondary battery.
The present application provides a secondary battery including:
a housing having an opening;
an electrode assembly housed within the case;
a top cover assembly including a top cover plate and an electrode terminal disposed on the top cover plate, the top cover plate being disposed at the opening;
an interposer connected between the electrode assembly and the electrode terminal;
and the insulating heat dissipation piece is arranged between the top cover plate and the adapter piece, and the heat conductivity coefficient of the insulating heat dissipation piece is greater than 1W/(m.k).
According to an aspect of an embodiment of the present application, the insulating heat sink is in contact with the top cover plate; and/or the insulating heat dissipation piece is in contact with the adapter sheet.
According to an aspect of an embodiment of the present application, the secondary battery further includes an insulating body;
the insulation body is provided with a through hole which is communicated along the thickness direction of the insulation body; the insulating heat sink is accommodated in the through hole.
According to an aspect of the embodiment of the present application, the thickness of the insulating heat dissipation member is greater than the height of the through hole, and the upper and lower surfaces of the insulating heat dissipation member respectively exceed the upper and lower surfaces of the insulating body.
According to an aspect of an embodiment of the present application, the insulating heat sink has a thermal conductivity greater than a thermal conductivity of the insulating body.
According to an aspect of the embodiment of the present application, the insulating heat sink and the insulating body are integrally injection-molded.
According to an aspect of an embodiment of the present application, the thermal conductivity of the insulating heat sink is greater than 20W/(m · k).
According to an aspect of the embodiment of the present application, the insulating heat sink is made of alumina ceramic.
According to an aspect of an embodiment of the present application, a first thermal conductive adhesive is disposed between the insulating heat sink and the top cover plate, and the insulating heat sink is bonded to the top cover plate through the first thermal conductive adhesive; and/or the presence of a gas in the gas,
and a second heat-conducting glue is arranged between the insulating heat-radiating piece and the switching piece, and the insulating heat-radiating piece is bonded to the switching piece through the second heat-conducting glue.
According to an aspect of the embodiment of the present application, the top cover plate and the housing are made of metal, and the top cover plate is welded to the housing.
The technical scheme provided by the application can achieve the following beneficial effects:
the secondary battery includes a case, an electrode assembly, and a cap assembly. The case has an opening, the electrode assembly is accommodated in the case, and the cap assembly includes a cap plate disposed at the opening and an electrode terminal disposed at the cap plate. The interposer is connected between the electrode assembly and the electrode terminal. The secondary battery provided by the application further comprises an insulating heat dissipation piece, wherein the insulating heat dissipation piece is arranged between the top cover plate and the adapter piece, and the heat conductivity coefficient of the insulating heat dissipation piece is larger than 1W/(m.k). Through setting up insulating heat dissipation spare, the adaptor piece can be in time when overflowing great, and the heat of production can in time be conducted to the lamina tecti through insulating heat dissipation spare, and then realizes the heat dissipation, prevents that secondary battery is inside to take place the thermal runaway, has improved secondary battery's security performance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a secondary battery provided in an embodiment of the present application;
fig. 2 is an exploded view of a secondary battery according to an embodiment of the present disclosure;
fig. 3 is a front sectional view of a secondary battery provided in an embodiment of the present application;
FIG. 4 is an enlarged view taken at A in FIG. 3;
fig. 5 is a cross-sectional view of an insulating heat sink in a secondary battery according to an embodiment of the present disclosure after being engaged with an insulating body;
fig. 6 is a schematic structural view of the secondary battery according to the embodiment of the present disclosure after the insulating heat sink is engaged with the insulating body;
fig. 7 is an exploded view of the insulating heat sink and the insulating body of the secondary battery according to the embodiment of the present disclosure.
Reference numerals:
1-a secondary battery;
11-a housing;
12-an electrode assembly;
121-pole ear;
13-a cap assembly;
131-a top cover plate;
132-electrode terminals;
133-an explosion-proof valve assembly;
14-an adaptor sheet;
15-an insulating heat sink;
16-an insulating body;
161-via.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
Fig. 1 is a schematic structural diagram of a secondary battery provided in an embodiment of the present application, and fig. 2 is an exploded schematic structural diagram of the secondary battery provided in the embodiment of the present application.
As shown in fig. 1 and 2, the present embodiment provides a secondary battery 1 including a case 11, an electrode assembly 12, and a cap assembly 13.
The case 11 may have a hexahedral shape or other shapes, and the case 11 has a receiving cavity formed therein for receiving the electrode assembly 12 and the electrolyte. One end of the case 11 has an opening such that the electrode assembly 12 can be placed in the receiving cavity of the case 11 through the opening, and a plurality of electrode assemblies 12 may be disposed in the receiving cavity, the plurality of electrode assemblies 12 being stacked one on another. The housing 11 may be made of a metal material such as aluminum, aluminum alloy, or nickel-plated steel, among others.
The electrode assembly 12 includes an electrode unit including a positive electrode plate, a negative electrode plate, and an isolation film located between the adjacent positive electrode plate and the negative electrode plate for isolating the positive electrode plate from the negative electrode plate.
In one possible design, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked and wound to form an electrode unit of the electrode assembly 12, that is, the electrode unit is a wound structure, and in another possible design, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked to form an electrode unit of the electrode assembly 12, which is a stacked structure. Meanwhile, the electrode unit is provided with a gap after being formed, and electrolyte can enter the electrode unit through the gap to soak the positive pole piece and the negative pole piece.
The negative electrode plate comprises a negative electrode current collector (such as copper foil) and a negative electrode active material layer (such as carbon or silicon) coated on the surface of the negative electrode current collector, and the positive electrode plate comprises a positive electrode current collector (such as aluminum foil) and a positive electrode active material layer (such as ternary material, lithium iron phosphate or lithium cobalt oxide) coated on the surface of the positive electrode current collector. The positive electrode tab 121 is connected with the positive electrode pole piece and extends out of the electrode unit, and the positive electrode tab 121 can be directly cut by a positive electrode current collector; the negative electrode tab 121 is connected to the negative electrode tab and extends from the electrode unit, and the negative electrode tab 121 may be directly cut from the negative electrode current collector.
As shown in fig. 1 and 2, the top cap assembly 13 includes a top cap plate 131 and two electrode terminals 132, the top cap plate 131 having a flat plate shape and having substantially the same size and shape as the opening of the case 11, and the top cap plate 131 is fixed to the opening of the case 11, thereby sealing the electrode assembly 12 and the electrolyte in the receiving cavity of the case 11. The top cover plate 131 is made of a metal material, and for example, the top cover plate 131 may be made of the same metal material as the material of the housing 11, such as: aluminum, steel, and the like. In the present embodiment, two electrode lead-out holes are provided in the top lid plate 11, and the electrode terminal 132 is provided in the electrode lead-out hole of the top lid plate 131.
One of the two electrode terminals 132 is a positive electrode terminal, the other is a negative electrode terminal, the positive electrode terminal 132 is electrically connected to the positive tab 121 through the interposer 14, and the negative electrode terminal 132 is electrically connected to the negative tab 121 through the interposer 14. That is, the secondary battery 1 further includes an interposer 14 connected between the electrode assembly 12 and the electrode terminal 132. The cap assembly 13 may further include an explosion-proof valve assembly 133, the explosion-proof valve assembly 133 may adopt an existing structure (e.g., a manner of providing an explosion-proof sheet), the explosion-proof valve assembly 133 is provided at a substantially middle position of the cap plate 131, and when the internal pressure of the secondary battery 1 is excessively large due to gas generated due to overcharge, overdischarge, or battery overheating, the explosion-proof sheet in the explosion-proof valve assembly 133 may be broken so that the gas formed inside the secondary battery 1 may be discharged to the outside, whereby the secondary battery 1 can be prevented from exploding.
With the current demand for rapid charging becoming greater, the interposer 14 will be subjected to a greater current, and the interposer 14 will therefore generate a higher amount of heat.
Fig. 3 is a main sectional view of a secondary battery according to an embodiment of the present invention, fig. 4 is an enlarged view of a portion a in fig. 3, fig. 5 is a sectional view of a secondary battery according to an embodiment of the present invention after an insulating heat sink is fitted to an insulating body, fig. 6 is a structural view of a secondary battery according to an embodiment of the present invention after an insulating heat sink is fitted to an insulating body, and fig. 7 is an exploded structural view of a secondary battery according to an embodiment of the present invention after an insulating heat sink is fitted to an insulating body.
As shown in fig. 3 to 7, the secondary battery 1 provided in the embodiment of the present application further includes an insulating heat sink 15 disposed between the top cover plate 131 and the interposer 14, where the insulating heat sink 15 has electrical insulation and a high thermal conductivity, and in the embodiment, the thermal conductivity of the insulating heat sink 15 is greater than 1W/(m · k).
When the interposer 14 generates high heat due to a large overcurrent, the heat can be conducted to the top cover plate 131 through the insulating heat sink 15 to be dissipated. Compared with the method of increasing the width or thickness of the interposer 14 to dissipate heat, the method has the advantages of improving the heat dissipation effect, occupying less space inside the secondary battery 1, and improving the energy density of the secondary battery 1. The heat in the secondary battery 1 is conducted and dissipated in time, so that the risk of thermal runaway in the secondary battery 1 can be greatly reduced, and the safety performance of the secondary battery 1 is improved.
As a possible implementation, the insulating heat sink 15 is in contact with the top cover plate 131, thereby improving the heat conduction effect of heat conduction. The insulating heat sink 15 may also contact the interposer 14, and the insulating heat sink 15 may also contact the top cover plate 131 and the interposer 14 at the same time, so that the heat conduction effect is better.
As a possible realization, the insulating and heat dissipating member 15 is a one-piece structure, and covers the top cover plate 131 entirely toward the bottom of the housing 11. In this way, when the heat generated by the interposer 14 is conducted to the insulating heat sink 15, the contact area between the insulating heat sink 15 and the top cover plate 131 is large enough, so the heat conduction effect is also better.
In the embodiment of the present application, the top cover plate 131 and the housing 11 are made of metal, and the top cover plate 131 is welded to the housing 11. Thus, a part of the heat can be radiated through the top cover plate 131, and the other part of the heat can be conducted to the case 11 through the top cover plate 131 and then radiated through the case 11. That is to say, after the insulating heat sink 15 is disposed, a heat conduction path from the interposer 14 to the insulating heat sink 15 and then to the top cover plate 131 can be formed, and a heat conduction path from the interposer 14 to the insulating heat sink 15 and then to the top cover plate 131 and the housing 11 can be formed, so that a better heat conduction effect is achieved.
As another possible implementation, the secondary battery 1 further includes an insulating body 16. The insulating body 16 is provided with a through hole 161 penetrating in the thickness direction (Z direction) of the insulating body 16, and the insulating heat sink 15 is accommodated in the through hole 161. The interposer 14 is disposed on both sides of the electrode assembly 12, and thus, in the present embodiment, for example, two through holes 161 and two insulating heat sinks 15 are provided, the through holes 161 are disposed at positions close to both ends of the insulating body 16 along the length direction (X direction) of the insulating body 16, and the insulating heat sinks 15 are disposed at the through holes 161.
The material of the insulating body 16 may be plastic, and the insulating body 16 made of plastic is provided with a through hole 161, so that the overall weight of the secondary battery 1 can be reduced. The size and shape of the through-hole 161 and the insulating heat sink 15 may be determined according to the size and shape of the interposer 14. Illustratively, the through-hole 161 is a square through-hole 161, and the insulating heat sink 15 is a rectangular sheet. In other embodiments, the insulating heat sink 15 may have other shapes, such as circular, triangular, etc., and the shape of the through hole 161 is adapted to the shape of the insulating heat sink 15.
Realize the heat dissipation through the cooperation that sets up insulator 16 and insulating heat sink 15, can need not the size of increase adaptor piece and realize the heat dissipation, also need not through other parts such as increase cooling tube, in the embodiment of this application, insulator 16 is littleer with the inside space of taking up secondary battery after the cooperation of insulating heat sink 15, has improved secondary battery's energy density.
As a possible implementation manner, the thickness of the insulating heat sink 15 is greater than the height of the through hole 161, and as shown in fig. 5, along the thickness direction (Z direction) of the insulating body 16, the lower surface H1 of the insulating heat sink 15 protrudes from the through hole 161, that is, protrudes from the lower surface H2 of the insulating body 16. Preferably, the upper and lower surfaces of the insulating heat sink 15 are beyond the upper and lower surfaces of the insulating body 16, respectively. That is, the upper surface of the insulating heat sink 15 exceeds the upper surface of the insulating body 16, and the lower surface of the insulating heat sink 15 exceeds the lower surface of the insulating body 16.
In this way, once the flatness of the upper and lower surfaces of the insulating body 16 is not high after molding, the insulating heat sink 15 can be sufficiently contacted with the top cover plate 131 and/or the adaptor plate 14, so as to achieve the best heat conduction effect. Illustratively, the insulation body 16 may form uneven upper and lower surfaces after being molded, when the thickness of the insulation heat sink 15 is larger than the height of the through hole 161, and the upper and lower surfaces of the insulation heat sink 15 respectively exceed the upper and lower surfaces of the insulation body 16, the insulation heat sink 15 can always contact with the top cover plate 131 and the interposer 14, and the heat conduction effect is ensured.
As a possible realization, the thermal conductivity of the insulating and heat dissipating member 15 is greater than the thermal conductivity of the insulating body 16. The insulating heat sink 15 and the insulating body 16 may be made of different materials, and the insulating body 16 may be made of a high temperature resistant insulating plastic material, such as one or more of polyphenylene sulfide (PPS), perfluoroalkoxy resin (PEA), or polypropylene (PP).
The insulating heat sink 15 and the insulating body 16 are fixed to each other and are disposed between the top cover plate 131 and the interposer 14. When the overcurrent of the adapter plate 14 is large, the generated heat is conducted to the top cover plate 131 through the insulating heat sink 15 and then to the housing 11, so as to achieve a better heat dissipation effect.
The insulating heat sink 15 may be integrally injection molded with the insulating body 16 so that the insulating body and the insulating body are stably connected and then placed together between the top cover plate 131 and the interposer 14.
The insulating heat sink 15 may also be inserted into the through hole 161 of the insulating body 16 by a dimensional fit, which is not further limited herein. Illustratively, the insulating heat sink 15 may be in interference fit with the through hole 161 to achieve the connection therebetween.
In order to further improve the heat conduction effect, the insulating heat conduction member is made of a material having a heat conduction coefficient of more than 15W/(m.k), preferably a high heat conduction ceramic material, and may be an alumina ceramic. The insulating body 16 can be made of an existing plastic material, so that the insulating body 16 is light and the effect of heat dissipation by using the insulating heat-conducting member can be achieved.
As a possible implementation manner, a first heat-conducting glue (not shown) is disposed between the insulating heat sink 15 and the top cover plate 131, and the insulating heat sink 15 is bonded to the top cover plate 131 through the first heat-conducting glue, so that the connection reliability between the insulating heat sink 15 and the top cover plate 131 is improved. On the other hand, set up first heat-conducting glue and can prevent that insulating radiating piece 15 and lamina tecti 131 from taking place to break away from, remain the contact state between insulating radiating piece 15 and the lamina tecti 131 throughout, the heat conduction effect is better. Illustratively, the first thermally conductive paste may be a thermally conductive silicone paste.
As a possible implementation manner, a second heat-conducting glue (not shown) is disposed between the insulating heat sink 15 and the adaptor piece 14, and the insulating heat sink 15 is adhered to the adaptor piece 14 through the second heat-conducting glue, so that the connection reliability between the insulating heat sink 15 and the adaptor piece 14 is improved. On the other hand, the second heat-conducting glue is arranged to prevent the insulating heat-radiating piece 15 from being separated from the adapter piece 14, the insulating heat-radiating piece 15 and the adapter piece 14 are always in a contact state, and the heat-conducting effect is better. Illustratively, the second thermally conductive paste may be a thermally conductive silicone paste.
As a possible implementation manner, a first heat-conducting glue and a second heat-conducting glue may be simultaneously disposed between the insulating heat sink 15 and the top cover plate 131, and between the insulating heat sink 15 and the interposer 14.
In summary, the secondary battery 1 provided in the embodiment of the present application includes a case 11, an electrode assembly 12, and a cap assembly 13. The case 11 has an opening, the electrode assembly 12 is received in the case 11, and the cap assembly 13 includes a cap plate 131 and an electrode terminal 132 disposed at the cap plate 131, the cap plate 131 being disposed at the opening. The interposer 14 is connected between the electrode assembly 12 and the electrode terminal 132. The secondary battery provided by the application further comprises an insulating heat sink 15 arranged between the top cover plate 131 and the adapter sheet 14, and the heat conductivity coefficient of the insulating heat sink 15 is greater than 1W/(m.k). Through setting up insulating heat sink 15, can make adaptor piece 14 when overflowing great, the heat that produces can be in time conducted to lamina tecti 131 through insulating heat sink 15, also can further conduct to casing 11, and then realizes the heat dissipation, prevents that secondary battery 1 is inside to take place the thermal runaway, has improved secondary battery 1's security performance.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A secondary battery (1), characterized by comprising:
a housing (11) having an opening;
an electrode assembly (12) housed in the case (11);
a top cover assembly (13) including a top cover plate (131) and an electrode terminal (132) provided to the top cover plate (131), the top cover plate (131) being provided to the opening;
an interposer (14) connected between the electrode assembly (12) and the electrode terminal (132);
the insulating heat dissipation piece (15) is arranged between the top cover plate (131) and the adapter sheet (14), and the heat conductivity coefficient of the insulating heat dissipation piece (15) is larger than 1W/(m.k).
2. The secondary battery (1) according to claim 1, wherein the insulating heat sink (15) is in contact with the top cover plate (131); and/or the presence of a gas in the gas,
the insulating heat dissipation piece (15) is in contact with the adapter sheet (14).
3. The secondary battery (1) according to claim 1 or 2, characterized in that the secondary battery (1) further comprises an insulating body (16);
the insulation body (16) is provided with a through hole (161) penetrating along the thickness direction of the insulation body (16); the insulating heat sink (15) is accommodated in the through hole (161).
4. The secondary battery (1) according to claim 3, wherein the insulating heat sink (15) has a thickness greater than the height of the through-hole (161), and upper and lower surfaces of the insulating heat sink (15) exceed upper and lower surfaces of the insulating body, respectively.
5. The secondary battery (1) according to claim 3, wherein the thermal conductivity of the insulating heat sink (15) is greater than the thermal conductivity of the insulating body (16).
6. The secondary battery (1) according to claim 3, wherein the insulating heat sink (15) is injection molded integrally with the insulating body (16).
7. The secondary battery (1) according to claim 1, wherein the thermal conductivity of the insulating heat sink (15) is greater than 15W/(m-k).
8. The secondary battery (1) according to claim 7, wherein the insulating heat sink (15) is made of alumina ceramic.
9. The secondary battery (1) according to claim 1, wherein a first thermally conductive adhesive is disposed between the insulating heat sink and the top cover plate, and the insulating heat sink is bonded to the top cover plate by the first thermally conductive adhesive; and/or the presence of a gas in the gas,
and a second heat-conducting glue is arranged between the insulating heat-radiating piece (15) and the adapter plate (14), and the insulating heat-radiating piece (15) is bonded to the adapter plate (14) through the second heat-conducting glue.
10. The secondary battery (1) according to claim 1, wherein the top cover plate (131) and the case (11) are made of metal, and the top cover plate (131) is welded to the case (11).
CN201921157828.2U 2019-07-22 2019-07-22 Secondary battery Active CN209843907U (en)

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CN201921157828.2U CN209843907U (en) 2019-07-22 2019-07-22 Secondary battery
EP19199774.1A EP3770988B1 (en) 2019-07-22 2019-09-26 Secondary battery
HUE19199774A HUE066156T2 (en) 2019-07-22 2019-09-26 Secondary battery
US16/658,626 US20210028425A1 (en) 2019-07-22 2019-10-21 Secondary battery
PCT/CN2020/096441 WO2021012842A1 (en) 2019-07-22 2020-06-17 Secondary battery and apparatus

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WO2021012842A1 (en) 2021-01-28
EP3770988B1 (en) 2023-12-27
HUE066156T2 (en) 2024-07-28
EP3770988A1 (en) 2021-01-27

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